One big advantage of the quad that is often neglected is turning
radius. Quads are great if you are in a tightly confined where you
can't afford to have long yagi elements hanging over property
lines or running into nearby trees.
73 de Mike, W4EF.................................
----- Original Message -----
From: "Joe Giacobello" <k2xx@swva.net>
> Rick, I'm not sure what you mean by directive, but there's no doubt that
> quads have poorer F/B than Yagis. Quads seem to have a very narrow
> frequency range over which the F/B peaks, but across the rest of the
> band it's at least 10 dB poorer than a Yagi, if not more. Nevertheless,
> I am using a four element, five band quad on a 24 ft. boom, and the
> model shows that forward gain is at least equivalent to a three element
> monoband Yagi on 20M and better on the higher frequency bands where the
> boom length is longer.
>
> I am also not thrilled with the common feed approach that Mike uses.
> Lew McCoy, in his review of LB quads indicated some interactions
> between harmonically related bands, i.e. 10 and 20 meters, but I
> believe that the feed system has been modified since then. I use
> separate feeds for each band via a remote switch and my experiences have
> been excellent. I have to admit that I've not done actual A/B testing
> on quads vs Yagis, but my on the air experiences indicate that they are
> quite competitive.
>
> I use LB parts in my home-brew quads, and they are of excellent quality.
> Mike also gives attentive, personalized service.
>
> Finally, I would say that a multiband quad is an easy way to get the
> equivalent of multiple monoband Yagis on a single, (relatively) simple
> support structure. There's a lot to be said for that.
>
>
> 73, Joe
>
_______________________________________________
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Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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